In mythology, Uranus (or Ouranos) is the son AND husband of Gaia (Earth). They had 18 kids together, but he hated having kids, so he hid the kids inside Gaia… in a cave I guess, presumably not the same cave he was having sex with. In response, she gave the youngest, Cronus, a magic sickle and he castrated Ouranos. So somehow, despite 63 Earths being able to fit inside Uranus, Uranus managed to fit himself inside of Earth at least 18 times.
It’s also crazy that astronomers didn’t go with the objectively cooler ‘Ouranos’ spelling of the name, and instead went with the ‘Your Anus’ spelling.